FAQ:
What is the difference between instant file upload and instant file upload by using the pre-hashing feature?
Before Drive and Photo Service performs instant file upload for a file, the server calculates the SHA-1 hash value of the entire file. The server confirms whether this SHA-1 hash value matches one of the SHA-1 hash values that the server calculated before. If this SHA-1 hash value does match, the server can instantly upload the file.
The calculation for the SHA-1 hash value of a large file is time-consuming. Therefore, the server can obtain the SHA-1 hash value of the first 1 KB data of the large file and confirm whether this SHA-1 hash value matches one of the SHA-1 hash values that the server calculated before. If this SHA-1 hash value does not match, the large file cannot be instantly uploaded. If this SHA-1 hash value does match, the server calculates the SHA-1 hash value of the entire file and determines whether to instantly upload the file based on the match result of the entire SHA-1 hash value. This pre-hashing feature saves time and computing capacity for instant file upload.
Why is the storage usage of a drive not immediately updated after a file is uploaded to the drive?
Drive and Photo Service asynchronously updates the storage usage of a drive. The result may be returned with a latency of 2 to 3 seconds.
What objects does the instant file upload feature support?
Drive and Photo Service supports the instant file upload feature at the file level. After a file is uploaded, the Drive and Photo Service server calculates and saves the SHA-1 hash value of the file. The instant file upload feature supports files with the same SHA-1 hash value.
Does Drive and Photo Service support resumable upload?
Yes, Drive and Photo Service supports resumable upload. If you want to perform resumable upload for a file, you can split the file into multiple parts. The finest granularity supported by the resumable upload feature is a part of the file. You cannot perform resumable upload for a single part.
What are the common causes of upload failures?
If your domain is in hosting mode, invalid cross-origin resource sharing (CORS) rules may result in a upload failure. Check whether the CORS rules configured for your Object Storage Service (OSS) bucket are valid.
An upload failure may occur due to the full storage usage of your drive. The error code returned for this cause is QuotaExhausted.
